Wordpress - use $wpdb->update and limit 1 - mysql

Question

It's probably a stupid question but I'm trying to use $wpdb->update instead of $wpdb->query but I'm not sure how to use limit 1. So instead of
$wpdb->query("update {$wpdb->prefix}vp_pms_group_users set read = '1', seen = '1', time_seen = '{$date_time_seen}' where message_id = '{$last_message_id}' and group_id = '{$group_id}' and to_username = '{$session_uid}' and read = '0' limit 1");
I've tried with
$wpdb->update($wpdb->prefix . "vp_pms_group_users", array(
'read' => '1',
'seen' => '1',
'time_seen' => $date_time_seen,
),
array(
'message_id' => $last_message_id,
'group_id' => $group_id,
'to_username' => $session_uid,
'read' => '0',
),
LIMIT 1 //????
);
Should I use limit after the array or inside it?
Thanks.

Answer 1

Here's an answer, it's not pretty, but based on looking through the method chain within $wpdb it's possibly the only way to achieve what you're after, and still use $wpdb->update().
Step 1.
Make your update with a unique parameter which you'll later replace, note that this must be the last parameter passed to the WHERE clause, otherwise replacing it with LIMIT 1 will cause a syntax error in your SQL statement.
Something like:
$wpdb->update(
$wpdb->prefix . "vp_pms_group_users",
array(...),
array(
...
'MyReplacementLimit' => 1
)
);
This should give you an SQL statement like so:
UPDATE vp_pms_group_users SET ... WHERE ... AND MyReplacementLimit = 1;
Step 2:
Now you can use the query filter to replace that fake clause with a limit...
add_filter('query', function ($query) {
return str_replace('AND MyReplacementLimit = 1', 'LIMIT 1', $query);
});
This is untested and is based purely on reading through the code available in $wpdb. It may need a few tweaks to get working correctly.
A simpler solution:
You could always just use SQL directly, so long as you're using $wpdb->prepare() it's probably easier to read, and more understandable than the above approach.

Answer 2

you should change Previous answer add_filter to this:
add_filter('query', function ($query) {
return str_replace("AND `MyReplacementLimit` = '1'", 'LIMIT 1', $query);
});